Method of monitoring on the basis of signal energy a transmission assembly of a vehicle equipped with acceleration sensors in particular a helicopter
First Claim
1. A method of monitoring a transmission assembly of a vehicle equipped with acceleration sensors, comprising the steps of:
- a) acquiring a signal from an acceleration sensor mounted on the transmission assembly for detecting the acceleration of a moving member of the transmission assembly;
b) calculating a transform in the frequency domain of said signal to obtain a sequence of samples;
c) acquiring a first and a second set of samples in said sequence of samples;
d) calculating the energies associated with said first and second set;
e) calculating a relative deviation between the energy of said first set and the energy of said first set and the energy of said second set;
f) comparing said relative deviation with at least a first predetermined threshold; and
g) generating an alarm signal if said relative deviation exceeds said at least a first predetermined threshold.
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Abstract
The method includes the steps of: acquiring a signal from an acceleration sensor; calculating the Fourier transform in the frequency domain of the signal to obtain a sequence of samples; acquiring from the sequence of samples a set of samples including samples at the meshing frequency of the gears monitored by the sensor, and samples at the harmonic frequencies of the meshing frequency; calculating the energies associated with the set of samples and the signal; calculating a noise energy parameter correlated to the ratio between the energy of the set of samples and the energy of the signal; comparing the noise energy parameter with at least one predetermined threshold; and generating an alarm signal in the event the noise energy parameter exceeds the threshold value.
9 Citations
12 Claims
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1. A method of monitoring a transmission assembly of a vehicle equipped with acceleration sensors, comprising the steps of:
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a) acquiring a signal from an acceleration sensor mounted on the transmission assembly for detecting the acceleration of a moving member of the transmission assembly; b) calculating a transform in the frequency domain of said signal to obtain a sequence of samples; c) acquiring a first and a second set of samples in said sequence of samples; d) calculating the energies associated with said first and second set; e) calculating a relative deviation between the energy of said first set and the energy of said first set and the energy of said second set; f) comparing said relative deviation with at least a first predetermined threshold; and g) generating an alarm signal if said relative deviation exceeds said at least a first predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification